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首页> 外文期刊>Oryx >Supportive release techniques provide no reintroduction benefit when efficacy and uptake is low
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Supportive release techniques provide no reintroduction benefit when efficacy and uptake is low

机译：当疗效和吸收率较低时，支持性释放技术不会带来重新引入的益处

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Release methods can influence the outcome of reintroductions. We tested the effect of delayed, immediate and supplementary food/shelter release treatments on the reintroduction of brushtail possums Trichosurus vulpecula to an environment in which introduced predators, particularly foxes, were subject to control. Monitoring of 48 radio-collared possums over 3 months revealed that immediate release possums settled into a stable range significantly faster than other groups, but there were no differences in survival, dispersal distance, reproduction or body condition. Ten days after release possums from all treatment groups had lost body mass, but by day 60 most were heavier than at the time of translocation. After release, possums sometimes used shelter sites easily accessible to predators, but within 3 weeks they regularly selected safer shelter. Risky shelter selection and loss of condition immediately after release suggests that supplementary food and shelter could be beneficial, but supportive measures were rarely used or did not have the desired effect. In an environment with higher predator densities, risky shelter selection could lead to high post-release predation, and mass loss could encourage animals to forage in riskier ways, further increasing vulnerability. In these environments effective uptake of supplementary food and shelter could reduce predation risk, but supplementary measures would need to be presented in a way that maximises uptake. In contrast, if post-release predation risk is low then supportive measures may not be required. Innovative methods for providing post-release support should continue to be developed for reintroductions to areas where supportive measures are needed.
机译：释放方法会影响重新引入的结果。我们测试了延缓，立即和补充食物/庇护所释放处理对于将引入的捕食者（特别是狐狸）加以控制的环境中的尾状负鼠Trichosurus vulpecula的重新引入的效果。在3个月内对48个放射性领的负鼠进行的监测显示，立即释放的负鼠稳定在稳定范围内的速度明显快于其他组，但存活率，分散距离，繁殖或身体状况没有差异。释放后十天，所有处理组的负鼠都失去了体重，但是到第60天，大多数人的体重都比移位时的重。释放后，负鼠有时会使用掠食者容易到达的庇护所，但三周之内他们会定期选择更安全的庇护所。危险的避难所选择和释放后立即失去状态表明补充食物和避难所可能是有益的，但很少使用支持性措施或没有达到预期的效果。在捕食者密度较高的环境中，危险的避难所选择可能导致释放后的捕食活动增多，而质量损失可能鼓励动物以更危险的方式进行觅食，从而进一步增加了脆弱性。在这些环境中，有效摄入补充食物和庇护所可以降低捕食的风险，但是需要采取使摄入量最大化的补充措施。相反，如果释放后的捕食风险低，则可能不需要采取支持措施。应继续开发提供释放后支持的创新方法，以便将其重新引入需要支持措施的领域。

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